M&S Dine in 2 for €12.50 offer

Could you have offered to pay by credit card? Have to be over 18 to have a credit card and could have saved a return trip (if you have one).

I tried explaining that I was civil service, had a photo id card and that you couldn't work in the civil service unless you were over 18 but no joy! I rang the manager later that day and then e mailed head office, mainly to vent my frustration I must admit.
 
Thanks for the tip on this.
Just back from M&S and got Chicken breasts with mozzarella and pesto melts, dauphinoise potatoes, chocolate profiteroles (about a dozen in the packet) and a bottle of red wine. Yum, yum
Asked the shop assistant and she said she thought they would be continuing with it every second week.